So-called “forever chemicals” have been detected in water samples collected at Haleakala National Park, the state Department of Health announced on Monday. 

The presence of perfluoroalkyl and polyfluoroalkyl substances were confirmed through multiple samples collected from the Haleakala Park Rain Shed Chlorinator (part of the Haleakala National Park water system) between Nov. 14, 2025 and March 31, 2026. The initial detection occurred on May 1, 2026.

According to DOH, the concentrations of PFAS detected are not expected to pose a significant public health risk.

While the federal Environmental Protection Agency does not regulate perfluorobutanoic acid, DOH has established environmental action levels (a risk-based screening tool for contamination of soil, water or air) for PFBA of 15 µg/l in surface water that may be used as a drinking water source. The samples taken at the Haleakala Park Rain Shed Chlorinator tested well below the surface water EAL.

PFAS are fluorinated organic chemicals that have been used since the 1940s in consumer products such as carpets, clothing, furniture fabrics, food packaging and cookware designed to be waterproof, stain-resistant or nonstick. PFAS are also used in firefighting foam and various industrial applications.

The EPA notes that some PFAS compounds have been associated with potential health effects following sufficient exposure over time.

Michael Tsai covers local and state politics for Spectrum News Hawaii. He can be reached at michael.tsai@charter.com.